Title: The new double energy-velocity spectrometer VERDI
Authors: JANSSON K.FREGEAU M. O.AL-ADILI A.GÖÖK ALFGUSTAVSSON C.HAMBSCH FRANZ-JOSEFOBERSTEDT STEPHANPOMP S.
Citation: EPJ Web of Conferences vol. 146 p. 04016
Publisher: EDP Sciences
Publication Year: 2017
JRC N°: JRC107945
ISSN: 2100 014X
URI: http://publications.jrc.ec.europa.eu/repository/handle/JRC107945
DOI: 10.1051/epjconf/201714604016
Type: Articles in periodicals and books
Abstract: VERDI (VElocity foR Direct particle Identification) is a fission-fragment spectrometer recently put into operation at JRC-Geel. It allows measuring the kinetic energy and velocity of both fission fragments simultaneously. The velocity provides information about the pre-neutron mass of each fission fragment when isotropic prompt-neutron emission from the fragments is assumed. The kinetic energy, in combination with the velocity, provides the post-neutron mass. From the difference between pre- and post-neutron masses, the number of neutrons emitted by each fragment can be determined. Multiplicity as a function of fragment mass and total kinetic energy is one important ingredient, essential for understanding the sharing of excitation energy between fission fragments at scission, and may be used to benchmark nuclear de-excitation models. The VERDI spectrometer design is a compromise between geometrical efficiency and mass resolution. The spectrometer consists of an electron detector located close to the target and two arrays of silicon detectors, each located 50 cm away from the target. In the present configuration pre-neutron and post-neutron mass distributions are in good agreement with reference data were obtained. Our latest measurements performed with spontaneously fissioning 252Cf is presented along with the developed calibration procedure to obtain pulse height defect and plasma delay time corrections.
JRC Directorate:Nuclear Safety and Security

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